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[填空题]已知ABC的周长是24cm，三边a、B、c满足c+a＝2b，c－a＝4cm，求a、B、c的长.
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举一反三：
[单选题]______________
A. so
B. because
C. even
D. and
[单选题]（ ）The purpose of the three ads is to __________.
A. sell these books to the children
B. help children learn English
C. help children learn about nature
D. use a dictionary to pronounce correctly
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